/*
 * This file is open source software, licensed to you under the terms
 * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership.  You may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
/*
 * Copyright (C) 2016 ScyllaDB
 * Copyright (c) 2022 StoneAtom, Inc. All rights reserved.
 */
#ifndef STONEDB_BASE_MANUAL_CLOCK_H_
#define STONEDB_BASE_MANUAL_CLOCK_H_
#pragma once

#include <chrono>

namespace stonedb {
namespace base {

class manual_clock {
 public:
  using rep = int64_t;
  using period = std::chrono::nanoseconds::period;
  using duration = std::chrono::duration<rep, period>;
  using time_point = std::chrono::time_point<manual_clock, duration>;

 private:
  static std::atomic<rep> _now;
  static void expire_timers();

 public:
  manual_clock();
  static time_point now() { return time_point(duration(_now.load(std::memory_order_relaxed))); }
  static void advance(duration d);
};

}  // namespace base
}  // namespace stonedb

#endif  // STONEDB_BASE_MANUAL_CLOCK_H_
